Hinged doors and operating mechanism therefor.



ROWNTREE. HINGED DOORS' AND OPERATING MECHANISM THEREFOR.

AFPLIOATION FILED, APR. 3, 1909.

Patented Mar. 3, 191 i 2 sums-21mm 1.

v ROWNTREE. HINGED DOORS OPERA I ING MECHANISM THEREFOR.- APPLICATIONFILED APR. 3, 1900.

1,088,936, Pa iznted Mar.3,1914.

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l/vi imam ca z 5] me Mow ml lfliafrow I UNITED STATES PATENT OFFICE.

HAROLD ROWNTREE, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,TO

' NATIONAL PNEUMATIC COMPANY, A CORPORATION OF WEST VIRGINIA,

KING-ED DOORS AND OPERATING MECHANISM THEREFOR.

. Specification of Letters Patent.

Patented Mar. 3, 1914..

, Application 1lledAprll3,1909. Serial No. 4s7,ee7.

Toall whom it may concern:

Be it known that I, HAROLD Rowu'rnan, a citizen of the United Statesresiding at Chicago, county of Cook, and state of Hinois, have made acertain new and useful Invention in Hinged Doors and Operating MechanismTherefor, of which the following is a specification.

This invention relates to hinged doors, and particularly to double hined doors and power operated actuating mec anism t ere- The object of theinvention is to provide a construction of double hinged doors andoperating mechanism therefor which is simple and eflicient.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination,location and relative arrangement of parts, all as will be more fullyhereinafter set forth, as shown in the accompanyingdrawings and finallypointed out in the appended claims.

Referring to the accompanying drawings,

. Figure 1 is. a view in top plan of a construction of door andassociated step and operating mechanism therefor, embodying theprinciples of my invention, parts in hor1zon tal section. Fig. 2 is aview' in vertical section on the line 2, 2, Fi 1..

The same part is desl gnated by the same reference sign wherever itoccurs.

In the drawing reference sign 3 designates the floor of a car, 4 are jambs, posts or other parts arranged to form a doorway space, or entrybetween them. At the sides of this doorway and adjacent the 'ambs orposts 4, are vertically extending -s afts 5, suitably journaled to rockin bearings rovided therefor. Castings 6, are carried y the shafts 5, torock or swing therewith. The doors 7 are secured to the castings 6, andsupported thereby. The shafts 5, are somewhat removed from the adjacentjambs or posts 4,

a so that the doors, when open, will lie close against the faces of thejambs. In order to close the space between the shafts and their adjacentjambs when the doors are closed; each door is provided on the edgethereof which is closest to the jamb, with an auxiliary narrow panel 8which, as indicated in dotted lines, in Flg. 1, forms a clotia supporttherefor.

sure for the space referred to when the door is closed. The narrowpanels 8 are carried by the extensions 9, of the castings 6. Thecastings, at or adjacent their outer or free ends are provided withextensions 10, in whlch. are carried vertical rods 11, designed to formhand grabs to aid passengers enterng or leaving the car, where myinvention is applied to street cars, to ascend to ordescend from thefloor of the car. The vertical rock shafts 5 may also serve the samepurpose.

To, the underside of the floor supportmg beam 12, or other suitable orconvenient part, 15 secured a castin 13, which may be arranged to formone o the bearings 22, in

which the shaft 5 is journaled.. Upon a pivot pin 14, carried by saidcastings -13,is f

pivotally-mounted a bracket 15, arranged to form a sup ort for a step16. Of course it will be un erstood that a similar support is provided,if desired, at each end of the ste so as to afford an efficient andsubstan- Each bracket 15 is provided with an extension 17, beyond theaxis of its supporting pivot in 14, and which extension cotiperateswitli an adjustable stop or limit pin 18, mounted in the casting 13, toform an abutment forthe step when in position for use, as clearly shown1n.Fig. 2. Pivotally connected atone end to the extension 17, of eachbracket 15, is a link 19, the other end of said link being pivotallyconnected to a crank arm 20, mounted on the adjacent shaft 5, whereby,when the shaft is rocked to open or close the door the step iscoiiperatingly moved into or out of position for use as the case may be.Since a casting 15, is provided for each end of the step, and eachcasting is connected to its adjacent shaft 5, it follows that theassociated doors, shafts and step must all move in unison.

Suit-ably supported by brackets 23, or otherwise, mounted on the innerface of the beam 12, or other convenient part, is a power cylinder 24.This cylinder. is open at both ends and has two oppositely faced pistons25, therein. The shafts 5, are provided with crank arms 26. which arerespectively connected by links 27, or otherwise, to the pistons 25,whereby when said' pistons are moved the shafts 5 are rocked. The pistheton rpds or links 27, extend through the open ends of the cylinder forconnection. to

istons. A valve device, indicated general y by reference sign A, Fig.1,-controls the supply and exhaust-of operating medium to and from thecylinder. In the form shown a pressure supply connection 28, ex-

tends from the valve or control device A, to a point midway the lengthof the cylinder 24, and betweenthe pistons 25. The valve or. controldevice comprises a valve 29, having an operating handle'30, and isadaptedf to operate over a seat surface 31, having the pressure supplyport 32, the exhaust port tails forms no part of the present invention,

and hence any suitable or convenient form of control device may beemployed.

Where the control device is manipulated so as to admit pressure mediumto the cylinder 24, at a point between thegpistons 25, said pistons areforced apart/thereby coincidently rocking the shafts .5, and henceswinging the doors closed, the doors being held in their closedpositions by the force of the pressure medium and when the pressuremedium is opened toeiihaust from the cylinder the doors are free to moveto open position. In order to insure themovement of the doors'to openposition when the pressure is exhausted from the cylinder 24, I provideeach shaft 5, with a crank arm 37, arranged to project in oppositedirections, and I connect-these'crank arms by means of a strong spiralor other spring 38, the tension of which is constantly exerted in adirection to hold the doors open. The operation of the doors to theirclosed position by the pressure medium acting on the pistons 25,- isagainst the tension of spring 38. Co incidently with the movementsof-the doors the actuation of the step 16 is also accomplished throughthe connections above described.

A door and operating mechanism there for, such as above described. issimple, in-- expensive, cheap and substantial, and 'can be easily andquickly installed. It is obvi ous that the control device A, may be lo.-oatcd at any convenient point.

By reason of the fact that the pressure medium holds the doors in theirclosed posilion it will be observed that I avoid the -ncce.ssity ofproviding ,positivc locking mechanism for thedoors when in thisposition. This is a desirable feature in street, subway or elevated carconstructions for the reason that while the doors are held closed with'suflicient degree of pressure to prevent thesame from being opened bypassengers lean-ingthereagains t, still, by applying concentrated forcethe doors may be opened in case of panic, accident or other cause, or incase the-conductor should be described means for cushioning the doormovements are not required. 1 I

Having now set forth the object and nature' of my invention, andaconstruction embodying the principles thereof, and having describedsuch construction, its purpose,

function and mode ofoperation, what I claim as new and useful and of myown lnvent on, and desire to secure by Letters Patent is l 1. Thecombination with'door jambs arranged on opposite sides of a doorway, avertical shaft Ournaled adjacent each jamb, a door connected to eachshaft, a crank arm on each shaft, a piston connected to each crank arm,a cylinder in which said pistons move in opposite d rections, and meansfor controlling the supply and exhaust of operating medium from thespace between said pistons.

'2. The combination with ja-mbs arranged onopposite sides of a doorway,a vertical shaft'journaled adjacent each jamb, a door connected to eachshaft, a crank arm on each shaft, a spring connecting said crank arms,independentpistons respectively connected to said shafts for rockingthesame, a cylinder in which both pistons operate and means forsimultaneously actuating said pistons against the tension of saidspring.

3. The combination with jambs arranged on opposite sides of a doorway, avertical shaft journaled adjacent each jamb, a door connected to eachshaft, a cranlearm on each shaft, independent pistons respectivelyconnectcd to said arms, a cylinder in which both pistons operate, meansfor simultaneously actuating said pistons injopposite directions, toopen the doors, and a spring having operative connection with bothshafts to close the doors.

4. The combination with vertical shafts respectively arranged on,opposite sides of a doorway, a door'connccted to each shaft,

a crank arm on each shaft, a piston connected to each crank ,arm, acylinder in which" said pistons move in oppo site direction, means for Icontrolling the supply and exhaust of operating medium set my hand inthe resence of the subscrib- Lo and from said cylinder m the space lngvitnesses, on t is 31st day of March hetween said pistons, and a, springhaving A. 1)., 1909.

connection with both of said shafts to yield- HAROLD ROWNTREE. 3 inglyoppose the action of said pistons Witnesses:

when the latter are actuated. LEMUEL M. SHIELDS,

In testimony whereof I have hereunto M. H. MARTIN.

